diff --git a/README.md b/README.md
index 47ed91a..3a382e7 100644
--- a/README.md
+++ b/README.md
@@ -97,6 +97,7 @@ Edit [docker-compose.traefik.yml](docker-compose.traefik.yml) or [docker-compose
 ```
 LDAP_SERVER: ldaps://LDAPSERVER:636
 LDAP_BASE: dc=DOMAIN,dc=TLD
+LDAP_SERVER_CACERT: /etc/ssl/certs/LDAPCERT
 # If LDAP_BINDDN is set, the ldap bind happens directly by using the provided DN
 # All occurrences of `%u` get replaced by the entered uid.
 # All occurrences of `%m`get replaced by the entered mail.
diff --git a/docker-compose.certbot.yml b/docker-compose.certbot.yml
index 4fc6365..69f5486 100644
--- a/docker-compose.certbot.yml
+++ b/docker-compose.certbot.yml
@@ -56,6 +56,7 @@ services:
 
       LDAP_SERVER: ldaps://LDAPSERVER:636
       LDAP_BASE: ou=people,dc=DOMAIN,dc=TLD
+      LDAP_SERVER_CACERT: /etc/ssl/certs/LDAPCERT
 
       ### There are to ways get users from the ldap server
 
diff --git a/docker-compose.traefik.yml b/docker-compose.traefik.yml
index 7ec5fb6..69fd810 100644
--- a/docker-compose.traefik.yml
+++ b/docker-compose.traefik.yml
@@ -137,6 +137,7 @@ services:
 
       LDAP_SERVER: ldaps://LDAPSERVER:636
       LDAP_BASE: ou=people,dc=DOMAIN,dc=TLD
+      LDAP_SERVER_CACERT: /etc/ssl/certs/LDAPCERT
 
       ### There are to ways get users from the ldap server
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 123f84a..811dea9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -54,6 +54,7 @@ services:
 
       LDAP_SERVER: ldaps://LDAPSERVER:636
       LDAP_BASE: ou=people,dc=DOMAIN,dc=TLD
+      LDAP_SERVER_CACERT: /etc/ssl/certs/LDAPCERT
 
       ### There are to ways get users from the ldap server